Create Notebook command allowed outside of extension load

[IanMatthewHuff]

For #7888

• Pull request represents a single change (i.e. not fixing disparate/unrelated things in a single PR)
• Title summarizes what is changing
• Has a news entry file (remember to thank yourself!)
• Appropriate comments and documentation strings in the code
• Has sufficient logging.
• Has telemetry for enhancements.
• Unit tests & system/integration tests are added/updated
• Test plan is updated as appropriate
• package-lock.json has been regenerated by running npm install (if dependencies have changed)
• The wiki is updated with any design decisions/details.

[codecov-io]

Codecov Report

Merging #7981 into master will decrease coverage by 0.65%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #7981      +/-   ##
==========================================
- Coverage   59.26%   58.61%   -0.66%     
==========================================
  Files         499      499              
  Lines       22400    22813     +413     
  Branches     3593     3770     +177     
==========================================
+ Hits        13275    13371      +96     
- Misses       8299     8613     +314     
- Partials      826      829       +3

Impacted Files	Coverage Δ
src/client/datascience/jupyter/jupyterExporter.ts	15.46% <0%> (-3.99%)	⬇️
src/client/datascience/cellFactory.ts	86.84% <0%> (-2.82%)	⬇️
src/client/datascience/jupyter/jupyterNotebook.ts	5.02% <0%> (-1.06%)	⬇️
.../datascience/interactive-common/interactiveBase.ts	5.85% <0%> (-0.38%)	⬇️
src/client/datascience/types.ts	100% <0%> (ø)	⬆️
src/client/datascience/common.ts	93.52% <0%> (+0.5%)	⬆️
src/datascience-ui/interactive-common/mainState.ts	50% <0%> (+4%)	⬆️

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